DC-bus operation Basic dimensioning Power distribution of controllers 7 7.5 7.5.2 7.5.2 Power distribution of controllers In a DC-bus operation, the power from the AC mains is stored in the DC bus and consumed by several controllers. Drive groups with non-synchronous power consumption, partial load or excess energy from braking operations are suitable for establishing a DC-bus connection.
L1, L2, L3 P LN P DC1 P DC2 P V P aN U, V, W Power distribution L1, L2, L3 Mains connection (3/PE AC) P Lr Input mains power P DC1 Total DC-bus power P DC2 DC-bus power available for the DC bus P loss Power loss P ar Output power U, V, W Motor connection 7.5.3 Motor efficiency For determining the power requirements, you have to consider the shaft power P shaft and the motor efficiency. The motor efficiency can be found under the motor data. 7.5.4 Power loss of devices When determining the power requirements, the power loss of the devices must be considered ( Tab. 7.4-5). 7.5-3 EDS94SPP101 EN 3.1-04/2007 ~ = = ~